def test_callback_closure():
checklist = []
WatchableThing = expose_as("WatchableThing", Thing, "func")
wt = WatchableThing()
spectator = watch(wt)
callbacks_called = [0, 0]
def callback(inst, call):
callbacks_called[0] += 1
def closure(value):
callbacks_called[1] += 1
assert checklist[-1] == Data(name=call.name,
value=value,
before=call)
return closure
spectator.callback("func", callback)
check_answer(checklist, wt, "func", 1, 2, c=3)
check_answer(checklist, wt, "func", 1, 2, d=3)
check_answer(checklist, wt, "func", 1, 2, 3, 4, 5)
check_answer(checklist, wt, "func", 1, 2, d=3, f=4)
assert callbacks_called == [4, 4]
def test_beforeback_afterback():
checklist = []
WatchableThing = expose_as("WatchableThing", Thing, "func")
wt = WatchableThing()
spectator = watch(wt)
callbacks_called = [0, 0]
# callback stores call information
def beforeback(inst, call):
callbacks_called[0] += 1
return call
def afterback(inst, answer):
callbacks_called[1] += 1
assert checklist[-1] == answer
spectator.callback("func", before=beforeback, after=afterback)
check_answer(checklist, wt, "func", 1, 2, c=3)
check_answer(checklist, wt, "func", 1, 2, d=3)
check_answer(checklist, wt, "func", 1, 2, 3, 4, 5)
check_answer(checklist, wt, "func", 1, 2, d=3, f=4)
assert callbacks_called == [4, 4]
def test_watch():
WatchableThing = expose_as("WatchableThing", Thing, "func")
wt = WatchableThing()
spectator = watch(wt)
assert isinstance(spectator, Spectator)
assert hasattr(wt, "_instance_spectator")
assert wt._instance_spectator is spectator
WatchableList = expose_as("WatchableList", list, "append")
wl, spectator = watched(WatchableList, [1, 2, 3])
assert wl == [1, 2, 3]
assert isinstance(spectator, Spectator)
assert hasattr(wl, "_instance_spectator")
assert wl._instance_spectator is spectator